Variable speed motor drive



Dec. 20, 1938. PB, RE VES T 2,140,942

VARIABLE SPEED MOTOR DRIVE Filed March 16, 1936 a /16 41 1.2 r J I I 12 I- -v INVENTORJ.

Balfifieyea and, BY Harv Ew /(6.,

ATTORNEYS. I

Patented Dec. 20, 193g. I

UNITED ,STAT'ELS 2.140342 vsamats sraan Mo'roa muva Paul B. Reeves and Harry E. Brooks, Columbus,

Ind., aslignors td'lteeves Pulley Company, Goflumbus, 1nd., a corporation of Indiana Application March 16, mo, Serial No. 09,113

iiClaims. (Cl.l4-230.1'i)

The present application relates to a variable speed motor drive, which might alsobe described as a unitary drive and transmission consisting of a motor and a countershait, with expansible pulleys carried upon the motor spindle and the countershaft, and means for controlling the effective diameters of therespective pulleys to vary the 'speed ratio between the motor spindle and the countershaft,'the whole organization being 1 carried on a unitary base with which, if desired,

there may be associated an enclosing cover or housing.

A primary object of the invention is to provide simplified structure of the character described, which shall nevertheless be highy efllcient and accurate in operation, and control. Further ob- ,iects of the invention will appear as the description proceeds.

To the accomplishment of the above and related objects, our invention may be embodied in the form illustrated'in the accompanying drawing, attention being called to the fact, however, that the drawingis illustrative only, and that change may be made in the specific construction 5 illustrated and described, so long as the scope of the appended claims is not violated. a

The figure is a plan view of one embodiment of our invention.

Referring more particularly to the drawing, it 30 will be seen that we have illustrated a base iii upon which is mounted a shaft ii, said shaft being journalled in bearings i2 and i3 provided by posts upstanding from said base. A coned disc it having an elongated hub i5 projecting 35 from itsconed face, is fixed to the shaft ii through the medium of any suitable fastening means, as it. A similar coned disc i1 is splincd on the hub I5 in facing relation to the disc i4; and a coiled spring i8 is sleeved on the hub l1 0 of the disc i1 and bears against the disc i1 and a stop collar i9, carried at the end of the hub I5, said spring it constantly urging the disc i1 toward the disc ll.

The base in is formed to provide a slide way 45 20 upon which is slidably carried a motor bed plate 2i carrying a motor 22 which has the usual spindle 23. A coned disc '24 having an elongated hub projecting from its coned face is fixed to thespindle 23 through the medium of suitable so fastening means, as 26. Said disc 24 and said disc M- facein the same direction.

A similar coned disc 21 is spiined on the hub 25 in facing relation to the disc 24, and a thrust bearing 28 is so connected to the hub 21' of the u disc 21 as to prevent relative axial movement between said disc 21 and said bearing. Said bearing 28 is provided with oppositely projecting trunnions 28, 29 which are embracedby the arms of a bracket 30 rigidly secured to, and projecting upwardly from, the base i0. Obviously, this 5 arrangement prevents movement of .the disc 21 in the direction of its own axis. F

A screw shaft 32 is ioumalled in a bearing 33 carried by the base it, and is operatively associated with the motor bed plate 2i, said shaft 32 10 being provided with a hand wheel 34 positioned outside the bearing 33.

An edge-active belt 35 provides a driving connection between the cone pair 24, 21 and the cone pair i4, i1. 1

The operation of the illustrated organization will be entirely clear. Assuming that the motor 22 is energized, the shaft ii will be driven, when the parts are in their illustrated positions, at an angular velocity considerably. greater than the 20 angular velocity of the spindle 23. If, now, the hand wheel 35 is rotated in a counter-clockwise direction, as viewed from the left of Fig. 1, the

,motor 22 will be shifted toward the left, carrying with it its spindle 23 and the disc 24 which :5 is fixed thereon. The bracket 30 will prevent corresponding axial movement of the disc 21, so that the'discs 24 and 21 will be separated. The spring ill will thus be permitted to force the disc i1 toward the disc i4, squeezing the belt 35 out- 30 wardly between said discs, and pulling the belt more deeply into the crotch between the discs 24 and 21, whereby the angular velocity of the shaft ii will be reduced.

correspondingly, clockwise rotation of the hand 35 wheel Stwill shift the disc 24 toward the disc 21, squeezing the belt 35 outwardly between .said discs, and pulling it more deeply into the crotch between the discs i4 and i1 to force the disc l1 toward the right against the tendency of the 0 spring i8, whereby the angular velocity of the L shaft i i will be increased.

We claim as our invention:

1. In a device of the class described, a base, a shaft associated with said base, a coned disc fixed 5 on said shaft, a second coned disc slidably mounted on said shaft in facing relation to said first disc, spring means urging said second disc toward said first disc, a motor carried by said base and having a spindle, a third coned disc mounted so on said spindle and oppositely faced with respect to said first disc, means securing said third disc against movement in the direction of its own axis, a fourth coned disc mounted on said spindle between said third disc and said motor, a belt a pairs, and means for positively shifting said motor andspindle axially in either direction, said fourth disc being fixed on said spindle.

2. In a device 01' the class described, a shaft, a second shaft substantially parallel with said firstmentioned shaft, an expansible V-pulley mounted on one of said shafts, an expansible V-pulley mounted on the other of said shafts, an edgeactive belt providing a driving connection between said pulleys, means for shifting one only of said shafts axially to effect an adjustment in the effective diameter of the pulley, carried by said one shaft, and means cooperating with said belt to effect a corresponding adjustment in the effective diameter of the pulley carried by the other shaft when said first-named pulley is adjusted.

3. In a device of the class described, a first shaft and, a second shaft substantially parallel therewith, a resiliently expansible V-pulley on one of said shafts, an expansible V-pulley on the other of said shafts and comprising a coned disc fixed to said other shaft and a mating coned disc held against axial movement, an edge-active belt providing a driving connection between said pulleys, and means for shifting said other shaft axially.

4. In a device of the class described, a shaft, a second shaft substantially parallel with said firstmentioned shaft, an expansible V-pulley mounted on each of said shafts and each comprising an axially fixed coned disc and a mating axially shiftable coned disc, an edge-active belt providing a driving connection between said pulleys, means for shifting one of said shafts axially, and means for causing one of said axially shiftable discs to partake of the axial movement of said shaft and for causing the other of said axially shiftable discs to move correspondingly.

5. In combination, a motor having a spindle, an expansible V-pulley drivingly associated with said spindle and comprising a coned disc fixed to said spindle anda second coned disc cooperatively associated therewith, a shaft substantially par- 5 allel with said spindle, a resiliently expansible V-pulley mounted on said shaft, an edge-active belt providing a driving connection between said shaft, an edge-active belt providing a driving connection between said pulleys, and means for shifting said motor in the direction of the axis of said spindle.

PAUL B; REEVES. HARRY E. BROOKS. 

